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2014 Chevy Silverado
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Old 03-31-2010, 10:10 AM
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Default Losing water,Water in exhaust,no loss of power?

I have a 94 Z71 with a 5.7 that has 126k miles on it.Its lossing about 1/2 a gallon of water a week,I can see water coming out the exhaust.But it has no loss of power,no stummbling no nothing.it had a tiny bit of water in the oil before but i have since then changed the oil twice with no water.can anyone explain this?i dont want to put up alot of money to fix it if i dont need to. thank you for any responce in advance.

p.s. i cant find a water leak either
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Old 03-31-2010, 05:01 PM
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could be head gasket or intake manifold
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Old 03-31-2010, 05:11 PM
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X2, intake manifold or head gasket.
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Old 03-31-2010, 08:51 PM
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X 3 on above
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Old 03-31-2010, 08:57 PM
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if it was a head gasket would coolant be getting into the oil and not water?
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Old 03-31-2010, 09:10 PM
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Quote:
Originally Posted by s34n View Post
if it was a head gasket would coolant be getting into the oil and not water?
I do not think he is putting coolant in, he is using water instead.
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Old 03-31-2010, 11:38 PM
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doesnt seem safe lol.
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Old 04-01-2010, 08:24 PM
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I use green coolant..:P
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Old 04-04-2010, 11:15 AM
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Pull a valve cover off if its a head gasket there will be so much snotty gook attached to the top it will let you know for sure. Unless you have a small air compressor you can also drain your oil then add just a small amount of of pressure to the coolant bottle overflow tube and then look for water coming out of the drain plug hole.

Head gaskets are a common problem on the 5.3 there is a small surface area between the water jacket and oil galley and I believe because of a combination of bad design flaws the head will always leak there usually after 100,000 miles. The flaw are one the small gasket area separating the water from the oil, the fact that the head bolts stretch and need locktite to keep them tight that I say eventually will weaken and the torque value on the top row of head bolts isnt as much as the other rows probably lead to premature loosening. My bolts were surprisingly already loose when I removed them to do my gasket.

There are also more extreme flaws for water in the coolant as well, there are plenty of google write ups about a series of bad heads and info on the part number for that series if you want to reference them.
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Old 04-04-2010, 09:42 PM
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my 350 was losing coolant and i never saw a leak,
had to have intake manifold gaskets replaced.
GM dealer charged $450 and that was a few years ago.
but 30K more miles and truck is still running good

If you have a 350 engine you need to check coolant tank level more often than oil level.
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